Bring out a red sponge ball and a small flashlight. Shine the penlight on the ball, lighting it up. Slowly remove the penlight from the ball. Magically, the ball remains lit up. Now, make the light dance back and forth between the penlight and ball and the ball and the penlight. After this intimate miracle, the light finally comes back to rest in the penlight. Both the penlight and the ball are handed out for examination. Of course, nothing can be found.